Hi Rutvik,
One way to verify the coverage of a cortical sheet
in the tlrc dataset would be to run 3dSurf2Vol with
the mask2 mapping function (using the same -f_steps,
etc., as from your 3dVol2Surf command).
You could even multiply the mask dataset by the
functional dataset and check the values or even
the histogram from the result. Hopefully you would
see a maximum of 10.5 there... :)
- rick